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Mathematics, 16.02.2021 05:30 koreanrice101

Two roads r1 and r2 and the streets between them s1 s2 s3 and s4 are shown. The intersections, represented by the points, lie on a circle, with the intersection of the four streets at the center of the circle shown. What is the measure of angle a between the two roads A 15
B 30
C 38
D 54
E 68

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